Hearing the cries for help, neighbors from all around rushed over to assist.
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history
From Wu Cheng'en's Ming-dynasty 《西游记》: 云来雾去,走石飞砂,唬得我一家并左邻右舍,俱不得安生 — 'clouds came and fog went, stones flew and sand blew, frightening my whole household and all the neighbors so that none could live in peace.'
memory
Literally 'left-neighbors, right-houses' — the four characters mirror a traditional Chinese courtyard layout where homes sit on your left and right sides.